So toddlers have some "knowledge between good and evil" (beyond the Deut 1:39 of "no knowledge" description) ... toddlers are able to "choose the good" ... toddlers are able to express faith in prayer... toddlers are able to repent...
So what reasons do you have that you militate against them and keep them from "coming unto Jesus" in baptism?
Same question for kindergarteners and first graders.
If they can then they can be believe and be baptized, but Scripture clearly speaks of a time before then can.